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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2406.11487">arXiv:2406.11487</a> <span> [<a href="https://arxiv.org/pdf/2406.11487">pdf</a>, <a href="https://arxiv.org/format/2406.11487">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Spinning Hall Probe magnetic compass </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2406.11487v1-abstract-short" style="display: inline;"> In a large range of physics and space experiments, the direction of the magnetic field needs to be determined with an accuracy on the level of one milli radian or better. We have proposed a new type of magnetic compass - a rotation-based one, which provides an alternating signal from the Hall probe proportional to the value of the magnetic field transverse to the axis of rotation. The spinning Hal… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.11487v1-abstract-full').style.display = 'inline'; document.getElementById('2406.11487v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2406.11487v1-abstract-full" style="display: none;"> In a large range of physics and space experiments, the direction of the magnetic field needs to be determined with an accuracy on the level of one milli radian or better. We have proposed a new type of magnetic compass - a rotation-based one, which provides an alternating signal from the Hall probe proportional to the value of the magnetic field transverse to the axis of rotation. The spinning Hall probe device has been realized. Alignment of the spinning axis for a minimum (zero) value of the signal allows us to find the direction of the magnetic field. The device does not require calibration and is free of any drift problems. The measurement of the rotation axis direction was accomplished by means of a laser and a flat mirror attached to the rotor. The constructed prototype achieved an accuracy for the magnetic field direction in the experiment with the polarized He-3 target on the level of one milli radian. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2406.11487v1-abstract-full').style.display = 'none'; document.getElementById('2406.11487v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 June, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">8 pages, 5 figures, accepted for proceedings SPIN2023</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.14142">arXiv:2402.14142</a> <span> [<a href="https://arxiv.org/pdf/2402.14142">pdf</a>, <a href="https://arxiv.org/format/2402.14142">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Adiabatic Light Guide with S-shaped Strips </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a>, <a href="/search/physics?searchtype=author&query=Brash%2C+E+J">E. J. Brash</a>, <a href="/search/physics?searchtype=author&query=Franklin%2C+G+B">G. B. Franklin</a>, <a href="/search/physics?searchtype=author&query=Rosso%2C+A">A. Rosso</a>, <a href="/search/physics?searchtype=author&query=Sarty%2C+A">A. Sarty</a>, <a href="/search/physics?searchtype=author&query=Shahinyan%2C+A">A. Shahinyan</a>, <a href="/search/physics?searchtype=author&query=Zimmerman%2C+E">E. Zimmerman</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.14142v2-abstract-short" style="display: inline;"> A light guide is an essential part of many scintillator counters and light collection systems. Our main interest is a light guide for a thin wide scintillator which has high light transmission while converting the area of the light source to the shape of a photo-detector. We propose a variation of the light guide which avoids a 90$\rm ^o$ twist of the strips, reduces the length of the light pipe,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.14142v2-abstract-full').style.display = 'inline'; document.getElementById('2402.14142v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.14142v2-abstract-full" style="display: none;"> A light guide is an essential part of many scintillator counters and light collection systems. Our main interest is a light guide for a thin wide scintillator which has high light transmission while converting the area of the light source to the shape of a photo-detector. We propose a variation of the light guide which avoids a 90$\rm ^o$ twist of the strips, reduces the length of the light pipe, and reduces the complexity of production. Detailed Monte Carlo simulation studies have been performed for a 3-strip S-shaped light-guide system. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.14142v2-abstract-full').style.display = 'none'; document.getElementById('2402.14142v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 21 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 17 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.04463">arXiv:2207.04463</a> <span> [<a href="https://arxiv.org/pdf/2207.04463">pdf</a>, <a href="https://arxiv.org/format/2207.04463">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2023.168035">10.1016/j.nima.2023.168035 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Concept of Very-Asymmetric Lepton Collider for Dark Matter Search </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Morozov%2C+V">Vasiliy Morozov</a>, <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">Bogdan Wojtsekhowski</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2207.04463v2-abstract-short" style="display: inline;"> Accelerator-based searches for dark matter are aiming for high sensitivity and need an experimental setup with high luminosity. This field of research is often called intensity frontier physics. One of the best motivated portals of interaction between dark matter and ordinary matter is a dark photon which could be observed as a resonance in the invariant mass of the decay products. Electron-positr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.04463v2-abstract-full').style.display = 'inline'; document.getElementById('2207.04463v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.04463v2-abstract-full" style="display: none;"> Accelerator-based searches for dark matter are aiming for high sensitivity and need an experimental setup with high luminosity. This field of research is often called intensity frontier physics. One of the best motivated portals of interaction between dark matter and ordinary matter is a dark photon which could be observed as a resonance in the invariant mass of the decay products. Electron-positron collisions are known to be the cleanest interaction for such a study. In this paper we propose a scheme for a collider which allows for a luminosity of a few orders of magnitude higher than could be obtained in a conventional symmetric collider and with a few times higher accessible mass than is possible using a positron beam and a fixed target approach. The key concept is based on asymmetric energies: a high-energy circulating positron beam and a low-energy high-intensity electron beam, and optimization of the beam interaction region. We present here a configuration of a collision region of 10 MeV electron and 4 GeV positron beams. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.04463v2-abstract-full').style.display = 'none'; document.getElementById('2207.04463v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 January, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">13 pages, 13 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2001.00999">arXiv:2001.00999</a> <span> [<a href="https://arxiv.org/pdf/2001.00999">pdf</a>, <a href="https://arxiv.org/format/2001.00999">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevD.101.032004">10.1103/PhysRevD.101.032004 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A limit on the anisotropy of the one-way maximum attainable speed of the electron </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Bergan%2C+W">W. Bergan</a>, <a href="/search/physics?searchtype=author&query=Forster%2C+M+J">M. J. Forster</a>, <a href="/search/physics?searchtype=author&query=Khachatryan%2C+V">V. Khachatryan</a>, <a href="/search/physics?searchtype=author&query=Rider%2C+N">N. Rider</a>, <a href="/search/physics?searchtype=author&query=Rubin%2C+D+L">D. L. Rubin</a>, <a href="/search/physics?searchtype=author&query=Vlahovic%2C+B">B. Vlahovic</a>, <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2001.00999v3-abstract-short" style="display: inline;"> We report here the first experimental result for the anisotropy of the one-way maximum attainable speed of the electron, $\vec{螖c_{1,e}}$, obtained via the study of a sidereal time dependence of a difference between the electron and positron beam momenta in the CESR storage ring at Cornell University. At 95 percent confidence, an upper limit for the component of $螖\vec {c}_{1,e}/c$ perpendicular t… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.00999v3-abstract-full').style.display = 'inline'; document.getElementById('2001.00999v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2001.00999v3-abstract-full" style="display: none;"> We report here the first experimental result for the anisotropy of the one-way maximum attainable speed of the electron, $\vec{螖c_{1,e}}$, obtained via the study of a sidereal time dependence of a difference between the electron and positron beam momenta in the CESR storage ring at Cornell University. At 95 percent confidence, an upper limit for the component of $螖\vec {c}_{1,e}/c$ perpendicular to Earth's rotational axis is found to be $5.5 \times 10^{-15}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2001.00999v3-abstract-full').style.display = 'none'; document.getElementById('2001.00999v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 January, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 November, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 5 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. D 101, 032004 (2020) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1912.07355">arXiv:1912.07355</a> <span> [<a href="https://arxiv.org/pdf/1912.07355">pdf</a>, <a href="https://arxiv.org/format/1912.07355">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2020.163429">10.1016/j.nima.2020.163429 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Conceptual Design Study of a Compact Photon Source (CPS) for Jefferson Lab </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Day%2C+D">D. Day</a>, <a href="/search/physics?searchtype=author&query=Degtiarenko%2C+P">P. Degtiarenko</a>, <a href="/search/physics?searchtype=author&query=Dobbs%2C+S">S. Dobbs</a>, <a href="/search/physics?searchtype=author&query=Ent%2C+R">R. Ent</a>, <a href="/search/physics?searchtype=author&query=Hamilton%2C+D+J">D. J. Hamilton</a>, <a href="/search/physics?searchtype=author&query=Horn%2C+T">T. Horn</a>, <a href="/search/physics?searchtype=author&query=Keller%2C+D">D. Keller</a>, <a href="/search/physics?searchtype=author&query=Keppel%2C+C">C. Keppel</a>, <a href="/search/physics?searchtype=author&query=Niculescu%2C+G">G. Niculescu</a>, <a href="/search/physics?searchtype=author&query=Reid%2C+P">P. Reid</a>, <a href="/search/physics?searchtype=author&query=Strakovsky%2C+I">I. Strakovsky</a>, <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a>, <a href="/search/physics?searchtype=author&query=Zhang%2C+J">J. Zhang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1912.07355v1-abstract-short" style="display: inline;"> This document describes the technical design concept of a compact high intensity, multi-GeV photon source. Capable of producing 10^12 equivalent photons per second this novel device will provide unprecedented access to physics processes with very small scattering probabilities such as hard exclusive reactions on the nucleon. When combined with dynamic nuclear polarized targets, its deployment will… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.07355v1-abstract-full').style.display = 'inline'; document.getElementById('1912.07355v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1912.07355v1-abstract-full" style="display: none;"> This document describes the technical design concept of a compact high intensity, multi-GeV photon source. Capable of producing 10^12 equivalent photons per second this novel device will provide unprecedented access to physics processes with very small scattering probabilities such as hard exclusive reactions on the nucleon. When combined with dynamic nuclear polarized targets, its deployment will result in a large gain in polarized experiment figure-of-merit compared to all previous measurements. Compared to a traditional bremsstrahlung photon source the proposed concept presents several advantages, most significantly in providing a full intensity in a small spot at the target and in taking advantage of the narrow angular spread associated with high energy bremsstrahlung compare to the wide angular distribution of the secondary radiation to minimize the operational prompt and activation radiation dose rates. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1912.07355v1-abstract-full').style.display = 'none'; document.getElementById('1912.07355v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 December, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 20 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1712.06419">arXiv:1712.06419</a> <span> [<a href="https://arxiv.org/pdf/1712.06419">pdf</a>, <a href="https://arxiv.org/format/1712.06419">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> Conceptual Design Report A Compact Photon Source </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a>, <a href="/search/physics?searchtype=author&query=Niculescu%2C+G">G. Niculescu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1712.06419v1-abstract-short" style="display: inline;"> We propose to build a shielded magnet that will act as an untagged bremsstrahlung photon source suitable for deployment in Hall A/C at Jefferson Lab. The goal of the project is a compact source which provides a narrow 1-mm diameter photon beam at the target with the intensity adequate to the polarized target operation. The proposed solution is based on the absorption of the electron beam in the ma… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.06419v1-abstract-full').style.display = 'inline'; document.getElementById('1712.06419v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1712.06419v1-abstract-full" style="display: none;"> We propose to build a shielded magnet that will act as an untagged bremsstrahlung photon source suitable for deployment in Hall A/C at Jefferson Lab. The goal of the project is a compact source which provides a narrow 1-mm diameter photon beam at the target with the intensity adequate to the polarized target operation. The proposed solution is based on the absorption of the electron beam in the magnet. The compactness is achieved by means of a shallow channel which leads to an electromagnetic shower in the Cu-W body of the channel and surrounding material after a 1-2~mm deflection of the beam electrons by a horizontal magnetic field. This source will allow us to achieve ten times the luminosity of the mixed electron--photon beam configuration while keeping the heat load on the (polarized) target as well as the radiation level in the experimental hall at acceptable levels. The concept for this device was developed for the experimental proposal PR12-15-003 but, if built, it would become a general--purpose source that would be usable for a variety of photon--induced reactions of interest in the 12-GeV era. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1712.06419v1-abstract-full').style.display = 'none'; document.getElementById('1712.06419v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">26 pages, 34 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1708.07901">arXiv:1708.07901</a> <span> [<a href="https://arxiv.org/pdf/1708.07901">pdf</a>, <a href="https://arxiv.org/format/1708.07901">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Phenomenology">hep-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/13/02/P02021">10.1088/1748-0221/13/02/P02021 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Searching for a dark photon: Project of the experiment at VEPP-3 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a>, <a href="/search/physics?searchtype=author&query=Baranov%2C+G+N">G. N. Baranov</a>, <a href="/search/physics?searchtype=author&query=Blinov%2C+M+F">M. F. Blinov</a>, <a href="/search/physics?searchtype=author&query=Levichev%2C+E+B">E. B. Levichev</a>, <a href="/search/physics?searchtype=author&query=Mishnev%2C+S+I">S. I. Mishnev</a>, <a href="/search/physics?searchtype=author&query=Nikolenko%2C+D+M">D. M. Nikolenko</a>, <a href="/search/physics?searchtype=author&query=Rachek%2C+I+A">I. A. Rachek</a>, <a href="/search/physics?searchtype=author&query=Shestakov%2C+Y+V">Yu. V. Shestakov</a>, <a href="/search/physics?searchtype=author&query=Tikhonov%2C+Y+A">Yu. A. Tikhonov</a>, <a href="/search/physics?searchtype=author&query=Toporkov%2C+D+K">D. K. Toporkov</a>, <a href="/search/physics?searchtype=author&query=Alexander%2C+J+P">J. P. Alexander</a>, <a href="/search/physics?searchtype=author&query=Battaglieri%2C+M">M. Battaglieri</a>, <a href="/search/physics?searchtype=author&query=Celentano%2C+A">A. Celentano</a>, <a href="/search/physics?searchtype=author&query=De+Vita%2C+R">R. De Vita</a>, <a href="/search/physics?searchtype=author&query=Marsicano%2C+L">L. Marsicano</a>, <a href="/search/physics?searchtype=author&query=Bond%C3%AC%2C+M">M. Bond矛</a>, <a href="/search/physics?searchtype=author&query=De+Napoli%2C+M">M. De Napoli</a>, <a href="/search/physics?searchtype=author&query=Italiano%2C+A">A. Italiano</a>, <a href="/search/physics?searchtype=author&query=Leonora%2C+E">E. Leonora</a>, <a href="/search/physics?searchtype=author&query=Randazzo%2C+N">N. Randazzo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1708.07901v3-abstract-short" style="display: inline;"> We propose an experiment to search for a new gauge boson A' in $e^+e^-$ annihilation by means of a positron beam incident on a gas hydrogen target internal to the bypass at the VEPP-3 storage ring. The search method is based on a missing mass spectra in the reaction $e^+e^-\rightarrow 纬$ A'. It allows observation of the A' signal independently of its decay modes and life time. The projected result… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.07901v3-abstract-full').style.display = 'inline'; document.getElementById('1708.07901v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1708.07901v3-abstract-full" style="display: none;"> We propose an experiment to search for a new gauge boson A' in $e^+e^-$ annihilation by means of a positron beam incident on a gas hydrogen target internal to the bypass at the VEPP-3 storage ring. The search method is based on a missing mass spectra in the reaction $e^+e^-\rightarrow 纬$ A'. It allows observation of the A' signal independently of its decay modes and life time. The projected result of this experiment corresponds to an upper limit on the square of the coupling constant $\varepsilon^2=3\cdot 10^{-8}$ with a signal-to-noise ratio of two to one at an A' mass of 5-20 MeV. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.07901v3-abstract-full').style.display = 'none'; document.getElementById('1708.07901v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 February, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 August, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">20 pages, 17 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1706.02747">arXiv:1706.02747</a> <span> [<a href="https://arxiv.org/pdf/1706.02747">pdf</a>, <a href="https://arxiv.org/ps/1706.02747">ps</a>, <a href="https://arxiv.org/format/1706.02747">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1142/9789812776211_0036">10.1142/9789812776211_0036 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Prospect for Measuring ${G_E^n}$ at High Momentum Transfers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1706.02747v1-abstract-short" style="display: inline;"> Experiment E02-013, approved by PAC21, will measure the neutron electric form factor at \qsq~up to 3.4 \gvsq, which is twice that achieved to date. The main features of the new experiment will be the use of the electron spectrometer BigBite, a large array of neutron detectors, and a polarized \he3~target. We present the parameters and optimization of the experimental setup. A concept of an experim… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.02747v1-abstract-full').style.display = 'inline'; document.getElementById('1706.02747v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.02747v1-abstract-full" style="display: none;"> Experiment E02-013, approved by PAC21, will measure the neutron electric form factor at \qsq~up to 3.4 \gvsq, which is twice that achieved to date. The main features of the new experiment will be the use of the electron spectrometer BigBite, a large array of neutron detectors, and a polarized \he3~target. We present the parameters and optimization of the experimental setup. A concept of an experiment for \GEN~where precision \GEP~data is used for calibration of the systematics of a Rosenbluth type measurement is also discussed. A concept of the circulating gas flow in the polarized He$^3$ target is presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.02747v1-abstract-full').style.display = 'none'; document.getElementById('1706.02747v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">9 pages, 4 figures, contribution to the proceedings of the workshop "Exclusive processes at High Momentum Transfer", May 15-18 2002, Newport News, Virginia, page 273-281</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1706.01267">arXiv:1706.01267</a> <span> [<a href="https://arxiv.org/pdf/1706.01267">pdf</a>, <a href="https://arxiv.org/ps/1706.01267">ps</a>, <a href="https://arxiv.org/format/1706.01267">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1051/epjconf/201714201029">10.1051/epjconf/201714201029 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Study of the one-way speed of light anisotropy with particle beams </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1706.01267v1-abstract-short" style="display: inline;"> Concepts of high precision studies of the one-way speed of light anisotropy are discussed. The high energy particle beam allows measurement of a one-way speed of light anisotropy (SOLA) via analysis of the beam momentum variation with sidereal phase without the use of synchronized clocks. High precision beam position monitors could provide accurate monitoring of the beam orbit and determination of… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.01267v1-abstract-full').style.display = 'inline'; document.getElementById('1706.01267v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1706.01267v1-abstract-full" style="display: none;"> Concepts of high precision studies of the one-way speed of light anisotropy are discussed. The high energy particle beam allows measurement of a one-way speed of light anisotropy (SOLA) via analysis of the beam momentum variation with sidereal phase without the use of synchronized clocks. High precision beam position monitors could provide accurate monitoring of the beam orbit and determination of the particle beam momentum with relative accuracy on the level of $10^{-10}$, which corresponds to a limit on SOLA of $10^{-18}$ with existing storage rings. A few additional versions of the experiment are also presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1706.01267v1-abstract-full').style.display = 'none'; document.getElementById('1706.01267v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 June, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pages, Advances in Dark Matter and Particle Physics, Messina 2017</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> EPJ Web Conf. 142 (2017) 01029 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1705.00051">arXiv:1705.00051</a> <span> [<a href="https://arxiv.org/pdf/1705.00051">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> </div> </div> <p class="title is-5 mathjax"> Very Asymmetric Collider for Dark Matter Search below 1 GeV </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a>, <a href="/search/physics?searchtype=author&query=Morozov%2C+V+S">V. S. Morozov</a>, <a href="/search/physics?searchtype=author&query=Derbenev%2C+Y+S">Y. S. Derbenev</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1705.00051v1-abstract-short" style="display: inline;"> Current searches for a dark photon in the mass range below 1 GeV require an electron-positron collider with a luminosity at the level of at least $10^{34}$ cm$^{-2}$s$^{-1}$. The challenge is that, at such low energies, the collider luminosity rapidly drops off due to increase in the beam sizes, strong mutual focusing of the colliding beams, and enhancement of collective effects. Using recent adva… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1705.00051v1-abstract-full').style.display = 'inline'; document.getElementById('1705.00051v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1705.00051v1-abstract-full" style="display: none;"> Current searches for a dark photon in the mass range below 1 GeV require an electron-positron collider with a luminosity at the level of at least $10^{34}$ cm$^{-2}$s$^{-1}$. The challenge is that, at such low energies, the collider luminosity rapidly drops off due to increase in the beam sizes, strong mutual focusing of the colliding beams, and enhancement of collective effects. Using recent advances in accelerator technology such as the nano-beam scheme of SuperKEK-B, high-current Energy Recovery Linacs (ERL), and magnetized beams, we propose a new configuration of an electron-positron collider based on a positron storage ring and an electron ERL. It allows one to achieve a luminosity of $>10^{34}$ cm$^{-2}$s$^{-1}$ at the center of momentum energy of <1 GeV. We present general considerations and a specific example of such a facility using the parameters of the SuperKEK-B positron storage ring and Cornell ERL project. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1705.00051v1-abstract-full').style.display = 'none'; document.getElementById('1705.00051v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 April, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2017. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1509.02754">arXiv:1509.02754</a> <span> [<a href="https://arxiv.org/pdf/1509.02754">pdf</a>, <a href="https://arxiv.org/format/1509.02754">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> On a sidereal time variation of the Lorentz force </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1509.02754v1-abstract-short" style="display: inline;"> We consider a search for a sidereal time variation of the beam trajectory in the cyclotron motion in a static magnetic field. The combination of two beams moving in opposite directions could allow a test of the radius stability with sensitivity approaching $10^{-10}$. Such a level of variation of the Lorentz force, if it exists, would require a speed of light anisotropy on the level of $10^{-18}$. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1509.02754v1-abstract-full" style="display: none;"> We consider a search for a sidereal time variation of the beam trajectory in the cyclotron motion in a static magnetic field. The combination of two beams moving in opposite directions could allow a test of the radius stability with sensitivity approaching $10^{-10}$. Such a level of variation of the Lorentz force, if it exists, would require a speed of light anisotropy on the level of $10^{-18}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1509.02754v1-abstract-full').style.display = 'none'; document.getElementById('1509.02754v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 September, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">3 pages, 1 figure</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1502.01772">arXiv:1502.01772</a> <span> [<a href="https://arxiv.org/pdf/1502.01772">pdf</a>, <a href="https://arxiv.org/format/1502.01772">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2015.02.012">10.1016/j.nima.2015.02.012 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> PMT signal increase using a wavelength shifting paint </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Allada%2C+K">K. Allada</a>, <a href="/search/physics?searchtype=author&query=Hurlbut%2C+C">Ch. Hurlbut</a>, <a href="/search/physics?searchtype=author&query=Ou%2C+L">L. Ou</a>, <a href="/search/physics?searchtype=author&query=Schmookler%2C+B">B. Schmookler</a>, <a href="/search/physics?searchtype=author&query=Shahinyan%2C+A">A. Shahinyan</a>, <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1502.01772v1-abstract-short" style="display: inline;"> We report a 1.65 times increase of the PMT signal and a simple procedure of application of a new wavelength shifting (WLS) paint for PMTs with non-UV-transparent windows. Samples of four different WLS paints, made from hydrocarbon polymers and organic fluors, were tested on a 5-inch PMT (ET 9390KB) using Cherenkov radiation produced in fused silica disks by $^{106}$Ru electrons on a `table-top' se… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.01772v1-abstract-full').style.display = 'inline'; document.getElementById('1502.01772v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1502.01772v1-abstract-full" style="display: none;"> We report a 1.65 times increase of the PMT signal and a simple procedure of application of a new wavelength shifting (WLS) paint for PMTs with non-UV-transparent windows. Samples of four different WLS paints, made from hydrocarbon polymers and organic fluors, were tested on a 5-inch PMT (ET 9390KB) using Cherenkov radiation produced in fused silica disks by $^{106}$Ru electrons on a `table-top' setup. The best performing paint was employed on two different types of 5-inch PMTs (ET 9390KB and XP4572B), installed in atmospheric pressure CO$_2$ gas Cherenkov detectors, and tested using GeV electrons. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1502.01772v1-abstract-full').style.display = 'none'; document.getElementById('1502.01772v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 5 February, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">6 pages, 8 figures, accepted NIM-A</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1501.05592">arXiv:1501.05592</a> <span> [<a href="https://arxiv.org/pdf/1501.05592">pdf</a>, <a href="https://arxiv.org/format/1501.05592">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="High Energy Astrophysical Phenomena">astro-ph.HE</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Methods for Astrophysics">astro-ph.IM</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1117/1.JATIS.4.1.011006">10.1117/1.JATIS.4.1.011006 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High energy photon polarimeter for astrophysics </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Eingorn%2C+M">Maxim Eingorn</a>, <a href="/search/physics?searchtype=author&query=Fernando%2C+L">Lakma Fernando</a>, <a href="/search/physics?searchtype=author&query=Vlahovic%2C+B">Branislav Vlahovic</a>, <a href="/search/physics?searchtype=author&query=Ilie%2C+C">Cosmin Ilie</a>, <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">Bogdan Wojtsekhowski</a>, <a href="/search/physics?searchtype=author&query=Urciuoli%2C+G+M">Guido Maria Urciuoli</a>, <a href="/search/physics?searchtype=author&query=De+Persio%2C+F">Fulvio De Persio</a>, <a href="/search/physics?searchtype=author&query=Meddi%2C+F">Franco Meddi</a>, <a href="/search/physics?searchtype=author&query=Nelyubin%2C+V">Vladimir Nelyubin</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1501.05592v4-abstract-short" style="display: inline;"> A high-energy photon polarimeter for astrophysics studies in the energy range from 10 MeV to 800 MeV is considered. The proposed concept uses a stack of silicon micro-strip detectors where they play the roles of both a converter and a tracker. The purpose of this paper is to outline the parameters of such a polarimeter and to estimate the productivity of measurements. Our study supported by a Mont… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.05592v4-abstract-full').style.display = 'inline'; document.getElementById('1501.05592v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1501.05592v4-abstract-full" style="display: none;"> A high-energy photon polarimeter for astrophysics studies in the energy range from 10 MeV to 800 MeV is considered. The proposed concept uses a stack of silicon micro-strip detectors where they play the roles of both a converter and a tracker. The purpose of this paper is to outline the parameters of such a polarimeter and to estimate the productivity of measurements. Our study supported by a Monte Carlo simulation shows that with a one-year observation period the polarimeter will provide 6% accuracy of the polarization degree for photon energies above 100 MeV, which would be a significant advance relative to the currently explored energy range of a few MeV. The proposed polarimeter design could easily be adjusted to the specific photon energy range to maximize efficiency if needed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1501.05592v4-abstract-full').style.display = 'none'; document.getElementById('1501.05592v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 April, 2018; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 January, 2015; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2015. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">19 pages, 7 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. of Astronomical Telescopes, Instruments, and Systems 4, 011006 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1409.6373">arXiv:1409.6373</a> <span> [<a href="https://arxiv.org/pdf/1409.6373">pdf</a>, <a href="https://arxiv.org/format/1409.6373">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="General Relativity and Quantum Cosmology">gr-qc</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Space Physics">physics.space-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1209/0295-5075/108/31001">10.1209/0295-5075/108/31001 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> On measurement of the isotropy of the speed of light </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1409.6373v3-abstract-short" style="display: inline;"> Three experimental concepts investigating possible anisotropy of the speed of light are presented. They are based on i) beam deflection in a 180 degree magnetic arc, ii) narrow resonance production in an electron-positron collider, and iii) the ratio of magnetic moments of an electron and a positron moving in opposite directions. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1409.6373v3-abstract-full" style="display: none;"> Three experimental concepts investigating possible anisotropy of the speed of light are presented. They are based on i) beam deflection in a 180 degree magnetic arc, ii) narrow resonance production in an electron-positron collider, and iii) the ratio of magnetic moments of an electron and a positron moving in opposite directions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.6373v3-abstract-full').style.display = 'none'; document.getElementById('1409.6373v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 November, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 22 September, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">a discussion of the high precision tests of special relativity, double ratio with e+ & e- beams</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1409.5393">arXiv:1409.5393</a> <span> [<a href="https://arxiv.org/pdf/1409.5393">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2015.02.017">10.1016/j.nima.2015.02.017 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Large Size GEM for Super Bigbite Spectrometer (SBS) Polarimeter for Hall A 12 GeV program at JLab </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Gnanvo%2C+K">Kondo Gnanvo</a>, <a href="/search/physics?searchtype=author&query=Liyanage%2C+N">Nilanga Liyanage</a>, <a href="/search/physics?searchtype=author&query=Nelyubin%2C+V">Vladimir Nelyubin</a>, <a href="/search/physics?searchtype=author&query=Saenboonruang%2C+K">Kiadtisak Saenboonruang</a>, <a href="/search/physics?searchtype=author&query=Sacher%2C+S">Seth Sacher</a>, <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">Bogdan Wojtsekhowski</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1409.5393v2-abstract-short" style="display: inline;"> We report on the R&D effort in the design and construction of a large size Gas Electron Multiplier (GEM) for the Proton Polarimeter Back Tracker (BT) of the Super Bigbite Spectrometer (SBS) in Hall A at Thomas Jefferson National Laboratory (JLab). The SBS BT GEM trackers consist of two sets of five large GEM xchambers of size 60 x 200 cm2. The GEM chamber is a vertical stack of four GEM modules, e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.5393v2-abstract-full').style.display = 'inline'; document.getElementById('1409.5393v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1409.5393v2-abstract-full" style="display: none;"> We report on the R&D effort in the design and construction of a large size Gas Electron Multiplier (GEM) for the Proton Polarimeter Back Tracker (BT) of the Super Bigbite Spectrometer (SBS) in Hall A at Thomas Jefferson National Laboratory (JLab). The SBS BT GEM trackers consist of two sets of five large GEM xchambers of size 60 x 200 cm2. The GEM chamber is a vertical stack of four GEM modules, each with an active area of 60 x 50 cm2. We have built and tested several prototypes and the construction of GEM modules for SBS BT is ongoing. We describe in this paper the design and construction of the GEM module prototype as well as the preliminary results on performance from tests carried out in our detector lab and during test beam at Fermi National Laboratory (Fermilab). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1409.5393v2-abstract-full').style.display = 'none'; document.getElementById('1409.5393v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 7 February, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 18 September, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">17 pages, 14 Figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Instruments and Methods in Physics Research A 782 (2015) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1406.6115">arXiv:1406.6115</a> <span> [<a href="https://arxiv.org/pdf/1406.6115">pdf</a>, <a href="https://arxiv.org/format/1406.6115">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2014.12.017">10.1016/j.nima.2014.12.017 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> The Heavy Photon Search Test Detector </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Battaglieri%2C+M">Marco Battaglieri</a>, <a href="/search/physics?searchtype=author&query=Boyarinov%2C+S">Sergey Boyarinov</a>, <a href="/search/physics?searchtype=author&query=Bueltmann%2C+S">Stephen Bueltmann</a>, <a href="/search/physics?searchtype=author&query=Burkert%2C+V">Volker Burkert</a>, <a href="/search/physics?searchtype=author&query=Celentano%2C+A">Andrea Celentano</a>, <a href="/search/physics?searchtype=author&query=Charles%2C+G">Gabriel Charles</a>, <a href="/search/physics?searchtype=author&query=Cooper%2C+W">William Cooper</a>, <a href="/search/physics?searchtype=author&query=Cuevas%2C+C">Chris Cuevas</a>, <a href="/search/physics?searchtype=author&query=Dashyan%2C+N">Natalia Dashyan</a>, <a href="/search/physics?searchtype=author&query=DeVita%2C+R">Raffaella DeVita</a>, <a href="/search/physics?searchtype=author&query=Desnault%2C+C">Camille Desnault</a>, <a href="/search/physics?searchtype=author&query=Deur%2C+A">Alexandre Deur</a>, <a href="/search/physics?searchtype=author&query=Egiyan%2C+H">Hovanes Egiyan</a>, <a href="/search/physics?searchtype=author&query=Elouadrhiri%2C+L">Latifa Elouadrhiri</a>, <a href="/search/physics?searchtype=author&query=Essig%2C+R">Rouven Essig</a>, <a href="/search/physics?searchtype=author&query=Fadeyev%2C+V">Vitaliy Fadeyev</a>, <a href="/search/physics?searchtype=author&query=Field%2C+C">Clive Field</a>, <a href="/search/physics?searchtype=author&query=Freyberger%2C+A">Arne Freyberger</a>, <a href="/search/physics?searchtype=author&query=Gershtein%2C+Y">Yuri Gershtein</a>, <a href="/search/physics?searchtype=author&query=Gevorgyan%2C+N">Nerses Gevorgyan</a>, <a href="/search/physics?searchtype=author&query=Girod%2C+F">Francois-Xavier Girod</a>, <a href="/search/physics?searchtype=author&query=Graf%2C+N">Norman Graf</a>, <a href="/search/physics?searchtype=author&query=Graham%2C+M">Mathew Graham</a>, <a href="/search/physics?searchtype=author&query=Griffioen%2C+K">Keith Griffioen</a>, <a href="/search/physics?searchtype=author&query=Grillo%2C+A">Alexander Grillo</a> , et al. (39 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1406.6115v3-abstract-short" style="display: inline;"> The Heavy Photon Search (HPS), an experiment to search for a hidden sector photon in fixed target electroproduction, is preparing for installation at the Thomas Jefferson National Accelerator Facility (JLab) in the Fall of 2014. As the first stage of this project, the HPS Test Run apparatus was constructed and operated in 2012 to demonstrate the experiment's technical feasibility and to confirm th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.6115v3-abstract-full').style.display = 'inline'; document.getElementById('1406.6115v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1406.6115v3-abstract-full" style="display: none;"> The Heavy Photon Search (HPS), an experiment to search for a hidden sector photon in fixed target electroproduction, is preparing for installation at the Thomas Jefferson National Accelerator Facility (JLab) in the Fall of 2014. As the first stage of this project, the HPS Test Run apparatus was constructed and operated in 2012 to demonstrate the experiment's technical feasibility and to confirm that the trigger rates and occupancies are as expected. This paper describes the HPS Test Run apparatus and readout electronics and its performance. In this setting, a heavy photon can be identified as a narrow peak in the e$^+$e$^-$ invariant mass spectrum, above the trident background or as a narrow invariant mass peak with a decay vertex displaced from the production target, so charged particle tracking and vertexing are needed for its detection. In the HPS Test Run, charged particles are measured with a compact forward silicon microstrip tracker inside a dipole magnet. Electromagnetic showers are detected in a PbW0$_{4}$ crystal calorimeter situated behind the magnet, and are used to trigger the experiment and identify electrons and positrons. Both detectors are placed close to the beam line and split top-bottom. This arrangement provides sensitivity to low-mass heavy photons, allows clear passage of the unscattered beam, and avoids the spray of degraded electrons coming from the target. The discrimination between prompt and displaced e$^+$e$^-$ pairs requires the first layer of silicon sensors be placed only 10~cm downstream of the target. The expected signal is small, and the trident background huge, so the experiment requires very large statistics. Accordingly, the HPS Test Run utilizes high-rate readout and data acquisition electronics and a fast trigger to exploit the essentially 100% duty cycle of the CEBAF accelerator at JLab. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1406.6115v3-abstract-full').style.display = 'none'; document.getElementById('1406.6115v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 June, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 June, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Revised version to match published version, 16 pages, 18 figures, published in Nuclear Instruments and Methods in Physics Research Section A, editor: Per Hansson Adrian</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> SLAC-PUB-15999 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Inst. and Methods in Physics Research, A Volume 777, 21 March 2015, Pages 91-101, ISSN 0168-9002 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1404.1534">arXiv:1404.1534</a> <span> [<a href="https://arxiv.org/pdf/1404.1534">pdf</a>, <a href="https://arxiv.org/ps/1404.1534">ps</a>, <a href="https://arxiv.org/format/1404.1534">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Accelerator Physics">physics.acc-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Materials Science">cond-mat.mtrl-sci</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.4884781">10.1063/1.4884781 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.4884781">10.1063/1.4884781 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.4884781">10.1063/1.4884781 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1063/1.4884781">10.1063/1.4884781 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> High-intensity positron microprobe at the Thomas Jefferson National Accelerator Facility </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Golge%2C+S">S. Golge</a>, <a href="/search/physics?searchtype=author&query=Vlahovic%2C+B">B. Vlahovic</a>, <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1404.1534v2-abstract-short" style="display: inline;"> We present a conceptual design for a novel continuous wave electron-linac based high-intensity high-brightness slow-positron production source with a projected intensity on the order of 10$^{10}$ e$^+$/s. Reaching this intensity in our design relies on the transport of positrons (T$_+$ below 600 keV) from the electron-positron pair production converter target to a low-radiation and low-temperature… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.1534v2-abstract-full').style.display = 'inline'; document.getElementById('1404.1534v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1404.1534v2-abstract-full" style="display: none;"> We present a conceptual design for a novel continuous wave electron-linac based high-intensity high-brightness slow-positron production source with a projected intensity on the order of 10$^{10}$ e$^+$/s. Reaching this intensity in our design relies on the transport of positrons (T$_+$ below 600 keV) from the electron-positron pair production converter target to a low-radiation and low-temperature area for moderation in a high-efficiency cryogenic rare gas moderator, solid Ne. This design progressed through Monte Carlo optimizations of: electron/positron beam energies and converter target thickness, transport of the e$^+$ beam from the converter to the moderator, extraction of the e$^+$ beam from the magnetic channel, a synchronized raster system, and moderator efficiency calculations. For the extraction of e$^+$ from the magnetic channel, a magnetic field terminator plug prototype has been built and experimental results on the effectiveness of the prototype are presented. The dissipation of the heat away from the converter target and radiation protection measures are also discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1404.1534v2-abstract-full').style.display = 'none'; document.getElementById('1404.1534v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 19 June, 2014; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 5 April, 2014; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2014. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">10 pages, 13 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Appl. Phys. 115, 234907 (2014) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1302.4324">arXiv:1302.4324</a> <span> [<a href="https://arxiv.org/pdf/1302.4324">pdf</a>, <a href="https://arxiv.org/format/1302.4324">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> Hall A Annual Report 2012 </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Riordan%2C+S">S. Riordan</a>, <a href="/search/physics?searchtype=author&query=Keppel%2C+C">C. Keppel</a>, <a href="/search/physics?searchtype=author&query=Aniol%2C+K">K. Aniol</a>, <a href="/search/physics?searchtype=author&query=Annand%2C+J">J. Annand</a>, <a href="/search/physics?searchtype=author&query=Arrington%2C+J">J. Arrington</a>, <a href="/search/physics?searchtype=author&query=Averett%2C+T">T. Averett</a>, <a href="/search/physics?searchtype=author&query=Gayoso%2C+C+A">C. Ayerbe Gayoso</a>, <a href="/search/physics?searchtype=author&query=Brash%2C+E">E. Brash</a>, <a href="/search/physics?searchtype=author&query=Cates%2C+G+D">G. D. Cates</a>, <a href="/search/physics?searchtype=author&query=Chen%2C+J+-">J. -P. Chen</a>, <a href="/search/physics?searchtype=author&query=Chudakov%2C+E">E. Chudakov</a>, <a href="/search/physics?searchtype=author&query=Flay%2C+D">D. Flay</a>, <a href="/search/physics?searchtype=author&query=Franklin%2C+G+B">G. B. Franklin</a>, <a href="/search/physics?searchtype=author&query=Friedman%2C+M">M. Friedman</a>, <a href="/search/physics?searchtype=author&query=Glamazdin%2C+O">O. Glamazdin</a>, <a href="/search/physics?searchtype=author&query=Gomez%2C+J">J. Gomez</a>, <a href="/search/physics?searchtype=author&query=Hanretty%2C+C">C. Hanretty</a>, <a href="/search/physics?searchtype=author&query=Hansen%2C+J+-">J. -O. Hansen</a>, <a href="/search/physics?searchtype=author&query=Hyde%2C+C">C. Hyde</a>, <a href="/search/physics?searchtype=author&query=Jones%2C+M+K">M. K. Jones</a>, <a href="/search/physics?searchtype=author&query=Korover%2C+I">I. Korover</a>, <a href="/search/physics?searchtype=author&query=LeRose%2C+J+J">J. J. LeRose</a>, <a href="/search/physics?searchtype=author&query=Lindgren%2C+R+A">R. A. Lindgren</a>, <a href="/search/physics?searchtype=author&query=Liyanage%2C+N">N. Liyanage</a>, <a href="/search/physics?searchtype=author&query=Long%2C+E">E. Long</a> , et al. (24 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1302.4324v1-abstract-short" style="display: inline;"> Report over the experimental activities in Hall A at Thomas Jefferson National Accelerator Facility. </span> <span class="abstract-full has-text-grey-dark mathjax" id="1302.4324v1-abstract-full" style="display: none;"> Report over the experimental activities in Hall A at Thomas Jefferson National Accelerator Facility. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1302.4324v1-abstract-full').style.display = 'none'; document.getElementById('1302.4324v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 February, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2013. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1302.2854">arXiv:1302.2854</a> <span> [<a href="https://arxiv.org/pdf/1302.2854">pdf</a>, <a href="https://arxiv.org/ps/1302.2854">ps</a>, <a href="https://arxiv.org/format/1302.2854">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2013.05.040">10.1016/j.nima.2013.05.040 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Scaler-Based Data Acquisition System for Measuring Parity-Violating Asymmetry in Deep Inelastic Scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Subedi%2C+R">Ramesh Subedi</a>, <a href="/search/physics?searchtype=author&query=Wang%2C+D">Diancheng Wang</a>, <a href="/search/physics?searchtype=author&query=Pan%2C+K">Kai Pan</a>, <a href="/search/physics?searchtype=author&query=Deng%2C+X">Xiaoyan Deng</a>, <a href="/search/physics?searchtype=author&query=Michaels%2C+R">Robert Michaels</a>, <a href="/search/physics?searchtype=author&query=Reimer%2C+P+E">Paul E. Reimer</a>, <a href="/search/physics?searchtype=author&query=Shahinyan%2C+A">Albert Shahinyan</a>, <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">Bogdan Wojtsekhowski</a>, <a href="/search/physics?searchtype=author&query=Zheng%2C+X">Xiaochao Zheng</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1302.2854v2-abstract-short" style="display: inline;"> An experiment that measured the parity-violating asymmetries in deep inelastic scattering was completed at the Thomas Jefferson National Accelerator Facility in experimental Hall A. From these asymmetries, a combination of the quark weak axial charge could be extracted with a factor of five improvement in precision over world data. To achieve this, asymmetries at the $10^{-4}$ level needed to be m… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1302.2854v2-abstract-full').style.display = 'inline'; document.getElementById('1302.2854v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1302.2854v2-abstract-full" style="display: none;"> An experiment that measured the parity-violating asymmetries in deep inelastic scattering was completed at the Thomas Jefferson National Accelerator Facility in experimental Hall A. From these asymmetries, a combination of the quark weak axial charge could be extracted with a factor of five improvement in precision over world data. To achieve this, asymmetries at the $10^{-4}$ level needed to be measured at event rates up to 600 kHz and the high pion background typical to deep inelastic scattering experiments needed to be rejected efficiently. A specialized data acquisition (DAQ) system with intrinsic particle identification (PID) was successfully developed and used: The pion contamination in the electron samples was controlled at the order of $2\times 10^{-4}$ or below with an electron efficiency of higher than 91 % during most of the production period of the experiment, the systematic uncertainty in the measured asymmetry due to DAQ deadtime was below 0.5 %, and the statistical quality of the asymmetry measurement agreed with the Gaussian distribution to over five orders of magnitudes. The DAQ system is presented here with an emphasis on its design scheme, the achieved PID performance, deadtime effect and the capability of measuring small asymmetries. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1302.2854v2-abstract-full').style.display = 'none'; document.getElementById('1302.2854v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 May, 2013; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 February, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">30 pages, 15 figures, to appear in Nuclear Instruments and Methods in Physics Research Section A</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1203.2712">arXiv:1203.2712</a> <span> [<a href="https://arxiv.org/pdf/1203.2712">pdf</a>, <a href="https://arxiv.org/format/1203.2712">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Chemical Physics">physics.chem-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.nima.2012.08.007">10.1016/j.nima.2012.08.007 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Polarized nuclear target based on parahydrogen induced polarization </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Budker%2C+D">D. Budker</a>, <a href="/search/physics?searchtype=author&query=Ledbetter%2C+M+P">M. P. Ledbetter</a>, <a href="/search/physics?searchtype=author&query=Appelt%2C+S">S. Appelt</a>, <a href="/search/physics?searchtype=author&query=Bouchard%2C+L+S">L. S. Bouchard</a>, <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1203.2712v1-abstract-short" style="display: inline;"> We discuss a novel concept of a polarized nuclear target for accelerator fixed-target scattering experiments, which is based on parahydrogen induced polarization (PHIP). One may be able to reach a 33% free-proton polarization in the ethane molecule. The potential advantages of such a target include operation at zero magnetic field, fast ($\sim$100 Hz) polarization reversal, and operation with larg… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1203.2712v1-abstract-full').style.display = 'inline'; document.getElementById('1203.2712v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1203.2712v1-abstract-full" style="display: none;"> We discuss a novel concept of a polarized nuclear target for accelerator fixed-target scattering experiments, which is based on parahydrogen induced polarization (PHIP). One may be able to reach a 33% free-proton polarization in the ethane molecule. The potential advantages of such a target include operation at zero magnetic field, fast ($\sim$100 Hz) polarization reversal, and operation with large intensity of an electron beam. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1203.2712v1-abstract-full').style.display = 'none'; document.getElementById('1203.2712v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 13 March, 2012; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2012. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 2 figures</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nucl Instr Meth Phys Res A, 694, 246-250 (2012) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1107.1902">arXiv:1107.1902</a> <span> [<a href="https://arxiv.org/pdf/1107.1902">pdf</a>, <a href="https://arxiv.org/format/1107.1902">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevC.84.065201">10.1103/PhysRevC.84.065201 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Gas dynamics in high-luminosity polarized He-3 targets using diffusion and convection </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Dolph%2C+P+A+M">P. A. M. Dolph</a>, <a href="/search/physics?searchtype=author&query=Singh%2C+J">J. Singh</a>, <a href="/search/physics?searchtype=author&query=Averett%2C+T">T. Averett</a>, <a href="/search/physics?searchtype=author&query=Kelleher%2C+A">A. Kelleher</a>, <a href="/search/physics?searchtype=author&query=Mooney%2C+K+E">K. E. Mooney</a>, <a href="/search/physics?searchtype=author&query=Nelyubin%2C+V">V. Nelyubin</a>, <a href="/search/physics?searchtype=author&query=Tobias%2C+W+A">W. A. Tobias</a>, <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a>, <a href="/search/physics?searchtype=author&query=Cates%2C+G+D">G. D. Cates</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1107.1902v2-abstract-short" style="display: inline;"> The dynamics of the movement of gas is discussed for two-chambered polarized He-3 target cells of the sort that have been used successfully for many electron scattering experiments. A detailed analysis is presented showing that diffusion is a limiting factor in target performance, particularly as these targets are run at increasingly high luminosities. Measurements are presented on a new prototype… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.1902v2-abstract-full').style.display = 'inline'; document.getElementById('1107.1902v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1107.1902v2-abstract-full" style="display: none;"> The dynamics of the movement of gas is discussed for two-chambered polarized He-3 target cells of the sort that have been used successfully for many electron scattering experiments. A detailed analysis is presented showing that diffusion is a limiting factor in target performance, particularly as these targets are run at increasingly high luminosities. Measurements are presented on a new prototype polarized He-3 target cell in which the movement of gas is due largely to convection instead of diffusion. NMR tagging techniques have been used to visualize the gas flow, showing velocities along a cylindrically-shaped target of between 5-80 cm/min. The new target design addresses one of the principle obstacles to running polarized He-3 targets at substantially higher luminosities while simultaneously providing new flexibility in target geometry. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1107.1902v2-abstract-full').style.display = 'none'; document.getElementById('1107.1902v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 September, 2011; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 July, 2011; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2011. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">First revision: 14 pages, 9 figures, submitted to Phys. Rev. C. We have shortened our discussion of the limitations inherent in various historical He-3 targets, and we have added a discussion exploring the optimal performance that can be expected from a suitably modified target based on diffusion-based mixing. A reference (Jones et. al.) was added. The results we present have not changed</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Rev. C 84, 065201 (13 December 2011) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0810.4630">arXiv:0810.4630</a> <span> [<a href="https://arxiv.org/pdf/0810.4630">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1393/ncb/i2009-10743-5">10.1393/ncb/i2009-10743-5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Performance of the Two Aerogel Cherenkov Detectors of the JLab Hall A Hadron Spectrometer </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Marrone%2C+S">S. Marrone</a>, <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B+B">B. B. Wojtsekhowski</a>, <a href="/search/physics?searchtype=author&query=Acha%2C+A">A. Acha</a>, <a href="/search/physics?searchtype=author&query=Cisbani%2C+E">E. Cisbani</a>, <a href="/search/physics?searchtype=author&query=Coman%2C+M">M. Coman</a>, <a href="/search/physics?searchtype=author&query=Cusanno%2C+F">F. Cusanno</a>, <a href="/search/physics?searchtype=author&query=de+Jager%2C+C+W">C. W. de Jager</a>, <a href="/search/physics?searchtype=author&query=De+Leo%2C+R">R. De Leo</a>, <a href="/search/physics?searchtype=author&query=Gao%2C+H">H. Gao</a>, <a href="/search/physics?searchtype=author&query=Garibaldi%2C+F">F. Garibaldi</a>, <a href="/search/physics?searchtype=author&query=Higinbotham%2C+D+W">D. W. Higinbotham</a>, <a href="/search/physics?searchtype=author&query=Iodice%2C+M">M. Iodice</a>, <a href="/search/physics?searchtype=author&query=LeRose%2C+J+J">J. J. LeRose</a>, <a href="/search/physics?searchtype=author&query=Macchia%2C+D">D. Macchia</a>, <a href="/search/physics?searchtype=author&query=Markowitz%2C+P">P. Markowitz</a>, <a href="/search/physics?searchtype=author&query=Nappia%2C+E">E. Nappia</a>, <a href="/search/physics?searchtype=author&query=Palmisano%2C+F">F. Palmisano</a>, <a href="/search/physics?searchtype=author&query=Urciuoli%2C+G+M">G. M. Urciuoli</a>, <a href="/search/physics?searchtype=author&query=van+der+Werf%2C+I">I. van der Werf</a>, <a href="/search/physics?searchtype=author&query=Xiang%2C+H">H. Xiang</a>, <a href="/search/physics?searchtype=author&query=Zhu%2C+L+Y">L. Y. Zhu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0810.4630v1-abstract-short" style="display: inline;"> We report on the design and commissioning of two silica aerogel Cherenkov detectors with different refractive indices. In particular, extraordinary performance in terms of the number of detected photoelectrons was achieved through an appropriate choice of PMT type and reflector, along with some design considerations. After four years of operation, the number of detected photoelectrons was found… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.4630v1-abstract-full').style.display = 'inline'; document.getElementById('0810.4630v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0810.4630v1-abstract-full" style="display: none;"> We report on the design and commissioning of two silica aerogel Cherenkov detectors with different refractive indices. In particular, extraordinary performance in terms of the number of detected photoelectrons was achieved through an appropriate choice of PMT type and reflector, along with some design considerations. After four years of operation, the number of detected photoelectrons was found to be noticeably reduced in both detectors as a result of contamination, yellowing, of the aerogel material. Along with the details of the set-up, we illustrate the characteristics of the detectors during different time periods and the probable causes of the contamination. In particular we show that the replacement of the contaminated aerogel and parts of the reflecting material has almost restored the initial performance of the detectors. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0810.4630v1-abstract-full').style.display = 'none'; document.getElementById('0810.4630v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 October, 2008; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2008. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">18 pages, 9 Figures, 4 Tables, 44 References</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuovo Cim.B124:99-114,2009 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/0704.1830">arXiv:0704.1830</a> <span> [<a href="https://arxiv.org/pdf/0704.1830">pdf</a>, <a href="https://arxiv.org/ps/0704.1830">ps</a>, <a href="https://arxiv.org/format/0704.1830">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> </div> </div> <p class="title is-5 mathjax"> An Electromagnetic Calorimeter for the JLab Real Compton Scattering Experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hamilton%2C+D+J">D. J. Hamilton</a>, <a href="/search/physics?searchtype=author&query=Shahinyan%2C+A">A. Shahinyan</a>, <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a>, <a href="/search/physics?searchtype=author&query=Annand%2C+J+R+M">J. R. M. Annand</a>, <a href="/search/physics?searchtype=author&query=Chang%2C+T+-">T. -H. Chang</a>, <a href="/search/physics?searchtype=author&query=Chudakov%2C+E">E. Chudakov</a>, <a href="/search/physics?searchtype=author&query=Danagoulian%2C+A">A. Danagoulian</a>, <a href="/search/physics?searchtype=author&query=Degtyarenko%2C+P">P. Degtyarenko</a>, <a href="/search/physics?searchtype=author&query=Egiyan%2C+K">K. Egiyan</a>, <a href="/search/physics?searchtype=author&query=Gilman%2C+R">R. Gilman</a>, <a href="/search/physics?searchtype=author&query=Gorbenko%2C+V">V. Gorbenko</a>, <a href="/search/physics?searchtype=author&query=Hines%2C+J">J. Hines</a>, <a href="/search/physics?searchtype=author&query=Hovhannisyan%2C+E">E. Hovhannisyan</a>, <a href="/search/physics?searchtype=author&query=Hyde-Wright%2C+C+E">C. E. Hyde-Wright</a>, <a href="/search/physics?searchtype=author&query=de+Jager%2C+C+W">C. W. de Jager</a>, <a href="/search/physics?searchtype=author&query=Ketikyan%2C+A">A. Ketikyan</a>, <a href="/search/physics?searchtype=author&query=Mamyan%2C+V+H">V. H. Mamyan</a>, <a href="/search/physics?searchtype=author&query=Michaels%2C+R">R. Michaels</a>, <a href="/search/physics?searchtype=author&query=Nathan%2C+A+M">A. M. Nathan</a>, <a href="/search/physics?searchtype=author&query=Nelyubin%2C+V">V. Nelyubin</a>, <a href="/search/physics?searchtype=author&query=Rachek%2C+I">I. Rachek</a>, <a href="/search/physics?searchtype=author&query=Roedelbrom%2C+M">M. Roedelbrom</a>, <a href="/search/physics?searchtype=author&query=Petrosyan%2C+A">A. Petrosyan</a>, <a href="/search/physics?searchtype=author&query=Pomatsalyuk%2C+R">R. Pomatsalyuk</a>, <a href="/search/physics?searchtype=author&query=Popov%2C+V">V. Popov</a> , et al. (4 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="0704.1830v3-abstract-short" style="display: inline;"> A lead-glass hodoscope calorimeter that was constructed for use in the Jefferson Lab Real Compton Scattering experiment is described. The detector provides a measurement of the coordinates and the energy of scattered photons in the GeV energy range with resolutions of 5 mm and 6%/\sqrt(E纬 [GeV]). Features of both the detector design and its performance in the high luminosity environment during the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0704.1830v3-abstract-full').style.display = 'inline'; document.getElementById('0704.1830v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="0704.1830v3-abstract-full" style="display: none;"> A lead-glass hodoscope calorimeter that was constructed for use in the Jefferson Lab Real Compton Scattering experiment is described. The detector provides a measurement of the coordinates and the energy of scattered photons in the GeV energy range with resolutions of 5 mm and 6%/\sqrt(E纬 [GeV]). Features of both the detector design and its performance in the high luminosity environment during the experiment are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('0704.1830v3-abstract-full').style.display = 'none'; document.getElementById('0704.1830v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 September, 2015; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 April, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2007. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">text updated according to published version</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-07-633 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Instruments and Methods A, Volume 643, Issue 1, 1 July 2011, Pages 17-28 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0702246">arXiv:physics/0702246</a> <span> [<a href="https://arxiv.org/pdf/physics/0702246">pdf</a>, <a href="https://arxiv.org/ps/physics/0702246">ps</a>, <a href="https://arxiv.org/format/physics/0702246">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Space Physics">physics.space-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1140/epjad/s2004-03-045-5">10.1140/epjad/s2004-03-045-5 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> A Pair Polarimeter for Linearly Polarized High Energy Photons </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=deJager%2C+C">C. deJager</a>, <a href="/search/physics?searchtype=author&query=Wojtsekhowski%2C+B">B. Wojtsekhowski</a>, <a href="/search/physics?searchtype=author&query=Tedeschi%2C+D">D. Tedeschi</a>, <a href="/search/physics?searchtype=author&query=Vlahovic%2C+B">B. Vlahovic</a>, <a href="/search/physics?searchtype=author&query=Abbott%2C+D">D. Abbott</a>, <a href="/search/physics?searchtype=author&query=Asai%2C+J">J. Asai</a>, <a href="/search/physics?searchtype=author&query=Feldman%2C+G">G. Feldman</a>, <a href="/search/physics?searchtype=author&query=Hotta%2C+T">T. Hotta</a>, <a href="/search/physics?searchtype=author&query=Khadaker%2C+M">M. Khadaker</a>, <a href="/search/physics?searchtype=author&query=Kohri%2C+H">H. Kohri</a>, <a href="/search/physics?searchtype=author&query=Matsumara%2C+T">T. Matsumara</a>, <a href="/search/physics?searchtype=author&query=Mibe%2C+T">T. Mibe</a>, <a href="/search/physics?searchtype=author&query=Nakano%2C+T">T. Nakano</a>, <a href="/search/physics?searchtype=author&query=Nelyubin%2C+V">V. Nelyubin</a>, <a href="/search/physics?searchtype=author&query=Orielly%2C+G">G. Orielly</a>, <a href="/search/physics?searchtype=author&query=Rudge%2C+A">A. Rudge</a>, <a href="/search/physics?searchtype=author&query=Weilhammer%2C+P">P. Weilhammer</a>, <a href="/search/physics?searchtype=author&query=Wood%2C+M">M. Wood</a>, <a href="/search/physics?searchtype=author&query=Yorita%2C+T">T. Yorita</a>, <a href="/search/physics?searchtype=author&query=Zegers%2C+R">R. Zegers</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="physics/0702246v1-abstract-short" style="display: inline;"> A high quality beam of linearly polarized photons of several GeV will become available with the coherent bremsstrahlung technique at JLab. We have developed a polarimeter which requires about two meters of the beam line, has an analyzing power of 20% and an efficiency of 0.02%. The layout and first results of a polarimeter test on the laser back-scattering photon beam at SPring-8/LEPS are presen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0702246v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0702246v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0702246v1-abstract-full" style="display: none;"> A high quality beam of linearly polarized photons of several GeV will become available with the coherent bremsstrahlung technique at JLab. We have developed a polarimeter which requires about two meters of the beam line, has an analyzing power of 20% and an efficiency of 0.02%. The layout and first results of a polarimeter test on the laser back-scattering photon beam at SPring-8/LEPS are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0702246v1-abstract-full').style.display = 'none'; document.getElementById('physics/0702246v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 February, 2007; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2007. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> JLAB-PHY-03-162 </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Eur.Phys.J.A19:S275-S278,2004 </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" aria-label="Secondary">  <div class="column"> <div class="columns"> <div class="column"> <ul class="nav-spaced"> <li><a href="https://info.arxiv.org/about">About</a></li> <li><a href="https://info.arxiv.org/help">Help</a></li> </ul> </div> <div class="column"> <ul class="nav-spaced"> <li> <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" class="icon filter-black" role="presentation"><title>contact arXiv</title><desc>Click here to contact arXiv</desc><path d="M502.3 190.8c3.9-3.1 9.7-.2 9.7 4.7V400c0 26.5-21.5 48-48 48H48c-26.5 0-48-21.5-48-48V195.6c0-5 5.7-7.8 9.7-4.7 22.4 17.4 52.1 39.5 154.1 113.6 21.1 15.4 56.7 47.8 92.2 47.6 35.7.3 72-32.8 92.3-47.6 102-74.1 131.6-96.3 154-113.7zM256 320c23.2.4 56.6-29.2 73.4-41.4 132.7-96.3 142.8-104.7 173.4-128.7 5.8-4.5 9.2-11.5 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